Wood floors and large tanks are not the best of friends, and regular floor studs will not support that tank for long in my opinion.

It might not fail at first, but it will likely settle in time and become unlevel which can create a disaster. You will need to brace it before setting up the tank. Consult a construction engineer or a home builder for the best strategy.

After you brace it, make sure your system is perfectly level both before and after filling. Test it with fresh water only for a few weeks, (no decorations) checking the level every few days until you are confident you can proceed._________________Keepin' marines happy for 25 years

Hmmm, read my post again---the idea is; make sure it's level BEFORE you put aquatic life in it. That way if there is a problem you can drain the fresh water and adjust the bracing. It's a simple testing process that may save you a lot of headaches._________________Keepin' marines happy for 25 years